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From "Josh Elser (JIRA)" <j...@apache.org>
Subject [jira] [Created] (ACCUMULO-697) Break Scanner parameterization from Key,Value to Key,{Something}
Date Sat, 21 Jul 2012 17:36:33 GMT
Josh Elser created ACCUMULO-697:
-----------------------------------

             Summary: Break Scanner parameterization from Key,Value to Key,{Something}
                 Key: ACCUMULO-697
                 URL: https://issues.apache.org/jira/browse/ACCUMULO-697
             Project: Accumulo
          Issue Type: Improvement
          Components: client
    Affects Versions: 1.5.0
            Reporter: Josh Elser
            Assignee: Josh Elser


When writing a custom iterator, many times the iterator has some semantic knowledge of what
each Key/Value being returned actually means (e.g. A word count could be returning Key/Value
but really is returning an Integer/Long count in the Value). This forces the client to know
what is going to be returned and handle the cast/transformation.

I believe it should be fairly straightforward to encapsulate this transformation inside the
Accumulo client code. I plan on investigating the possibility of changing the ScannerBase
impl, or perhaps making a TypedScannerBase, in which the iterator at the "top" of the stack
for a scan can return something other than a Value to the client.

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